Hell Hath No Fury is one of all time favourite Charmed episodes. It's great that they show the main characters dealing with the death of Prue in different ways.
This episode focuses on Piper's grief towards Prue. She gets turned into a fury, who punish evil-doers.
Another plotline was Paige misuing magic. I get the personal gain thing, but come, how is enhancing her breast size an exact punishment? That was probably the most dissapointing aspect of the episode.
Piper's mourning at the end of the episode was absolutely saddening to watch. Holly is such an amazing actress, she can do anything.
Overall this episode sees Paige becoming a closer member of the family, Piper trying to overcome her grief, and Phoebe and Cole, well, being Phoebe and Cole.